Answer
It is generally avoided because fetal harm is possible, but a specialist may consider it when maternal benefit outweighs the risk. Pregnancy or plans to conceive should be discussed promptly.
Sources for this answer
- Valcyte 450mg film-coated tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.